| 1. | There is a particular choice of the inertial and gravitational masses.
|
| 2. | To date, no other accurate method for measuring gravitational mass has been discovered.
|
| 3. | Gravity is calculated by Newton's law of universal gravitation, which depends on gravitational mass.
|
| 4. | Why are inertial mass and gravitational mass the same thing?
|
| 5. | Ever since conservation of momentum requires that active and passive gravitational mass be identical.
|
| 6. | At high speeds, relativistic mass always exceeds gravitational mass.
|
| 7. | The semi-major axis is known if the mean motion and the gravitational mass are known.
|
| 8. | Photons have energy and therefore also have mass in the usual sense of gravitational mass.
|
| 9. | This is possible because spacetime is radically curved in close vicinity to a large gravitational mass.
|
| 10. | :Sounds like you are talking about a substance with a different gravitational mass than inertial mass.
|